The robots could drive up to computers, plug thumdrives with stuxnet on them. Ok maybe that's a little too far... Hack computers with little robots running metasploit. You can get kali linux on raspberry pi either on a full install or on docker so that would help. You could definitely do stuff. You could make a security bot that roams the roams around taking video. There's a lot of cool stuff you could do. I'd love to see what you do with them.